Dow Jones Industrial Average
The Dow Jones Industrial Average (DJIA) is a price-weighted index tracking 30 large, blue-chip U.S. companies listed on the NYSE and NASDAQ, serving as one of the oldest and most widely recognized indicators of U.S. stock market performance. It was created by Charles Dow and Edward Jones in 1896.
The Dow Jones Industrial Average is arguably the most famous stock market index in the world. When first published on May 26, 1896, the DJIA consisted of just 12 industrial companies, including cotton, gas, sugar, tobacco, and railroad enterprises that were central to the American economy of that era. Over the decades, its composition evolved to reflect the changing structure of U.S. industry — today, it includes technology titans like Apple and Microsoft, financial giants like Goldman Sachs and JPMorgan Chase, and healthcare leaders like UnitedHealth Group and Johnson & Johnson.
The DJIA is price-weighted, meaning that a company with a higher stock price carries more influence over the index's daily movement than a company with a lower stock price, regardless of actual market capitalization. This methodology, a historical artifact from the pre-computer era when simple arithmetic was needed to calculate an index, can create counterintuitive outcomes. For example, because Apple underwent a 4-for-1 stock split in 2020, its post-split price became one-quarter of its former level, reducing its DJIA weighting significantly — even though its market cap remained unchanged. The Dow divisor, a proprietary constant updated to account for splits, spinoffs, and component changes, is used to calculate the index level.
Despite its methodological limitations, the DJIA remains an important cultural and financial barometer. News reports on the health of 'the market' in the United States almost universally reference the Dow's daily point movement. Major milestones — the Dow crossing 10,000 points in 1999, 20,000 in 2017, and 30,000 in 2020 — generated significant media coverage. Conversely, the Dow's single-day points decline of 2,997 points on March 16, 2020, amid COVID-19 panic, was the largest single-day drop in its history at that time.
The 30 components of the DJIA are selected by editors of The Wall Street Journal, without a fixed formula, and are intended to represent a broad cross-section of the U.S. economy. Component changes are rare but historically significant: General Electric, one of the original 1896 members, was removed from the index in 2018 after decades of underperformance — symbolizing the broader transformation of the American industrial economy into a services- and technology-driven one.
For educational purposes, financial analysts generally view the S&P 500 as a more statistically robust representation of U.S. equities because it covers 500 companies and uses market-cap weighting. The DJIA, however, retains outsized media and cultural prominence, and its movements are still closely watched by market participants, journalists, and policymakers as a high-level gauge of American corporate health.